O

C. The phase occurs as a result of

shear-type transformation

β → ω

. The

orientation relationship

between

ω

- and

β

-phases is: {0001}

||

{111}

and

〈 〉

||

〈

〉

. Small

ω

-phase precipitates (of

mean size

∼

3 nm) have

coherent

interfaces, are

equiaxed

, and are arranged homogeneously.